Controllable aperture stop, compact camera module and electronic device

ABSTRACT

A controllable aperture stop includes a light pass portion, a fixed portion, a driving part and rollable elements. The light pass portion includes movable blades together surrounding a light pass aperture. The fixed portion has shaft structures corresponding to the movable blades. The driving part includes a rotatable element, a magnet and a coil. The rotatable element is for driving the movable blades to rotate relative to the shaft structures to adjust the size of the light pass aperture. The magnet is disposed on the rotatable element. The coil corresponds to the magnet. The magnet and the coil are to drive the rotatable element to rotate around the light pass aperture. The rollable elements are disposed between the fixed portion and the rotatable element and arranged around the light pass aperture, so the rotatable element is rotatable relative to the fixed portion.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 111107076, filedon Feb. 25, 2022, which is incorporated by reference herein in itsentirety.

BACKGROUND Technical Field

The present disclosure relates to a controllable aperture stop, acompact camera module and an electronic device, more particularly to acontrollable aperture stop and a compact camera module applicable to anelectronic device.

Description of Related Art

With the development of semiconductor manufacturing technology, theperformance of image sensors has been improved, and the pixel sizethereof has been scaled down. Therefore, featuring high image qualitybecomes one of the indispensable features of an optical system nowadays.Furthermore, due to the rapid changes in technology, electronic devicesequipped with optical systems are trending towards multi-functionalityfor various applications, and therefore the functionality requirementsfor the optical systems have been increasing.

Recently, compact camera modules are applied in more and more fields,such as portable devices (e.g., smartphones, action cameras), augmentedreality and virtual reality head-mounted devices or aerial cameras.Moreover, the hardwares of the compact camera modules are constantlyupgraded, such as larger image sensors and imaging lenses with betterimage quality. A larger image sensor provides better image quality, butthe background in the pictures may become blurry. Conventionally,controllable aperture stops can be used to adjust the blur degree of thebackground and control the amount of incident light. However, due to thelimitation of the size, it is difficult for the camera modules to beequipped with controllable aperture stops. In specific, there are someproblems occurring when conventional controllable aperture stops areapplied to compact camera modules. For example, light-blocking bladescan be easily damaged with the reduction of the size of camera modules,the total weight may be too heavy, and several precision requirements(e.g., the size and position precisions of light pass aperture) cannotbe satisfied.

SUMMARY

According to one aspect of the present disclosure, a controllableaperture stop includes a light pass portion, a fixed portion, a drivingpart and a plurality of rollable elements. The light pass portionincludes a plurality of movable blades, and the movable blades togethersurround a light pass aperture. The fixed portion has a plurality ofshaft structures respectively disposed corresponding to the movableblades. The driving part includes a rotatable element, a first magnetand a first coil. The rotatable element is connected to the movableblades, and the rotatable element is configured to drive the movableblades to rotate respectively relative to the shaft structures so as toadjust a size of the light pass aperture. The first magnet is disposedon the rotatable element. The first coil is disposed corresponding tothe first magnet, and the first coil is located farther away from thelight pass aperture than the first magnet to the light pass aperture.The first magnet and the first coil are configured to drive therotatable element to rotate around the light pass aperture. The rollableelements are disposed between the fixed portion and the rotatableelement and arranged around the light pass aperture, so that therotatable element can be rotated relative to the fixed portion. Inaddition, when a farthest distance between the first magnet and acentral axis of the light pass aperture is rm, a shortest distancebetween the first coil and the central axis is rc, and a shortestdistance between the rollable elements and the central axis is rb, thefollowing conditions are satisfied:

0.5≤rm/rc<1; and

0.6≤rb/rm≤1.8.

According to another aspect of the present disclosure, a controllableaperture stop includes a light pass portion, a fixed portion, a drivingpart and a plurality of rollable elements. The light pass portionincludes a plurality of movable blades, and the movable blades togethersurround a light pass aperture. The fixed portion has a plurality ofshaft structures respectively disposed corresponding to the movableblades. The driving part includes a rotatable element, a first magnetand a first coil. The rotatable element is connected to the movableblades, and the rotatable element is configured to drive the movableblades to rotate respectively relative to the shaft structures so as toadjust a size of the light pass aperture. The first magnet is disposedon the rotatable element. The first coil is disposed corresponding tothe first magnet, and the first coil is located farther away from thelight pass aperture than the first magnet to the light pass aperture.The first magnet and the first coil are configured to drive therotatable element to rotate around the light pass aperture. The rollableelements are disposed between the fixed portion and the rotatableelement and arranged around the light pass aperture, so that therotatable element can be rotated relative to the fixed portion. Inaddition, the fixed portion includes a frame element, and the frameelement is in physical contact with the rollable elements so as tosupport the rollable elements and the rotatable element. The frameelement includes a metal component and a clad component, and the metalcomponent is insert-molded with the clad component to together form theframe element. The metal component has a plurality of filled holes, andthe clad component is filled into the filled holes. The filled holes andthe first magnet do not overlap with each other in a direction parallelto a central axis of the light pass aperture.

According to another aspect of the present disclosure, a controllableaperture stop includes a light pass portion, a fixed portion, a drivingpart and a plurality of rollable elements. The light pass portionincludes a plurality of movable blades, and the movable blades togethersurround a light pass aperture. The fixed portion has a plurality ofshaft structures respectively disposed corresponding to the movableblades. The driving part includes a rotatable element, a first magnetand a first coil. The rotatable element is connected to the movableblades, and the rotatable element is configured to drive the movableblades to rotate respectively relative to the shaft structures so as toadjust a size of the light pass aperture. The first magnet is disposedon the rotatable element. The first coil is disposed corresponding tothe first magnet, and the first coil is located farther away from thelight pass aperture than the first magnet to the light pass aperture.The first magnet and the first coil are configured to drive therotatable element to rotate around the light pass aperture. The rollableelements are disposed between the fixed portion and the rotatableelement and arranged around the light pass aperture, so that therotatable element can be rotated relative to the fixed portion. Inaddition, the fixed portion includes a frame element, and the frameelement is in physical contact with the rollable elements so as tosupport the rollable elements and the rotatable element. The frameelement includes a metal component and a clad component, and the metalcomponent is insert-molded with the clad component to together form theframe element. The metal component includes an attraction portion. Theattraction portion is ferromagnetic and disposed corresponding to thefirst magnet so as to generate a magnetic attraction, and the magneticattraction forces the first magnet and the rotatable element to exert apressure on the rollable elements. The first magnet includes a firstsurface, a second surface and a connection surface. The first surfacefaces the first coil, and the second surface is located closer to thelight pass aperture than the first surface to the light pass aperture.The connection surface is connected to the first surface and the secondsurface, and the attraction portion is disposed corresponding to theconnection surface.

According to another aspect of the present disclosure, a controllableaperture stop includes a light pass portion, a fixed portion and adriving part. The light pass portion includes a plurality of movableblades, and the movable blades together surround a light pass aperture.The fixed portion has a plurality of shaft structures respectivelydisposed corresponding to the movable blades. The driving part includesa rotatable element, a first magnet, a first coil and an electroniccomponent. The rotatable element is connected to the movable blades, andthe rotatable element is configured to drive the movable blades torotate respectively relative to the shaft structures so as to adjust asize of the light pass aperture. The first magnet is disposed on therotatable element. The first coil is disposed corresponding to the firstmagnet, and the first coil is located farther away from the light passaperture than the first magnet to the light pass aperture. The firstmagnet and the first coil are configured to drive the rotatable elementto rotate around the light pass aperture. The electronic component has aposition sensing circuit, the electronic component is disposedcorresponding to the first magnet, and the electronic component islocated farther away from the light pass aperture than the first magnetto the light pass aperture. In addition, when a farthest distancebetween the first magnet and a central axis of the light pass apertureis rm, a shortest distance between the first coil and the central axisis rc, and a shortest distance between the electronic component and thecentral axis is rp, the following conditions are satisfied:

0.5≤rm/rc<1; and

0.5≤rm/rp<1.

According to another aspect of the present disclosure, a controllableaperture stop includes a light pass portion, a fixed portion, a drivingpart and a plurality of rollable elements. The light pass portionincludes a plurality of movable blades, and the movable blades togethersurround a light pass aperture. The fixed portion has a plurality ofshaft structures respectively disposed corresponding to the movableblades. The driving part includes a rotatable element, a first magnetand an electronic component. The rotatable element is rotatable aroundthe light pass aperture, and the rotatable element is connected to themovable blades. The rotatable element is configured to drive the movableblades to rotate respectively relative to the shaft structures so as toadjust a size of the light pass aperture. The first magnet is disposedon the rotatable element. The electronic component has a positionsensing circuit. The electronic component is disposed corresponding tothe first magnet, and the electronic component is located farther awayfrom the light pass aperture than the first magnet to the light passaperture. The rollable elements are disposed between the fixed portionand the rotatable element and arranged around the light pass aperture,so that the rotatable element can be rotated relative to the fixedportion. In addition, when a farthest distance between the first magnetand a central axis of the light pass aperture is rm, a shortest distancebetween the electronic component and the central axis is rp, and ashortest distance of the plurality of rollable elements and the centralaxis is rb, the following conditions are satisfied:

0.5≤rm/rp<1; and

0.6≤rb/rm≤1.8.

According to another aspect of the present disclosure, a compact cameramodule includes one of the aforementioned controllable aperture stops,and the controllable aperture stop is disposed on an aperture positionof the compact camera module. In addition, when a focal length of thecompact camera module is f, and an aperture area of the light passaperture is a1, the following condition is satisfied:

1.19≤f/√(a1)≤11.99.

According to another aspect of the present disclosure, an electronicdevice includes the aforementioned compact camera module.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a perspective view of a compact camera module according to the1st embodiment of the present disclosure;

FIG. 2 is an exploded view of the compact camera module in FIG. 1 ;

FIG. 3 is a sectional view of a controllable aperture stop and a lensassembly of the compact camera module in FIG. 1 ;

FIG. 4 is a side view of the controllable aperture stop and the lensassembly of the compact camera module in FIG. 3 ;

FIG. 5 is an exploded view of the controllable aperture stop of thecompact camera module in FIG. 1 ;

FIG. 6 is another exploded view of the controllable aperture stop of thecompact camera module in FIG. 1 ;

FIG. 7 is an exploded view of a light pass portion of the controllableaperture stop in FIG. 5 ;

FIG. 8 is an exploded view of a shaft element of a fixed portion, arotatable element of a driving part and one movable blade of the lightpass portion in FIG. 5 ;

FIG. 9 is a perspective view of rollable elements and the frame elementof the fixed portion in FIG. 5 ;

FIG. 10 is an enlarged top view of region EL1 in FIG. 9 ;

FIG. 11 is another perspective view of the frame element of the fixedportion in FIG. 5 ;

FIG. 12 is a sectional view of the frame element in FIG. 11 ;

FIG. 13 is a schematic view of the relative position of a metalcomponent of the frame element of the fixed portion and magnets of thedriving part in FIG. 5 ;

FIG. 14 is a perspective view of a flexible printed circuit board, coilsand an electronic component of the driving part in FIG. 5 ;

FIG. 15 is a perspective and partial view of a driving part of thecompact camera module according to another configuration of the 1stembodiment of the present disclosure;

FIG. 16 is a cross-sectional view of the controllable aperture stop inFIG. 4 ;

FIG. 17 is a top view of the controllable aperture stop of the compactcamera module in a maximum aperture state according to the 1stembodiment of the present disclosure;

FIG. 18 is a top view of the controllable aperture stop of the compactcamera module in another aperture state according to the 1st embodimentof the present disclosure;

FIG. 19 is a top view of the controllable aperture stop of the compactcamera module in another aperture state according to the 1st embodimentof the present disclosure;

FIG. 20 is a perspective view of a compact camera module according tothe 2nd embodiment of the present disclosure;

FIG. 21 is a sectional view of a controllable aperture stop of thecompact camera module in FIG. 20 ;

FIG. 22 is a side view of the controllable aperture stop of the compactcamera module along line 22-22 in FIG. 21 ;

FIG. 23 is an exploded view of the controllable aperture stop of thecompact camera module in FIG. 20 ;

FIG. 24 is another exploded view of the controllable aperture stop ofthe compact camera module in FIG. 20 ;

FIG. 25 is an exploded view of a light pass portion of the controllableaperture stop in FIG. 23 ;

FIG. 26 is a perspective view of rollable elements and a frame elementof a fixed portion in FIG. 23 ;

FIG. 27 is an enlarged top view of region EL2 in FIG. 26 ;

FIG. 28 is another perspective view of the frame element of the fixedportion in FIG. 23 ;

FIG. 29 is a schematic view of the relative position of a metalcomponent of the frame element of the fixed portion and magnets of adriving part in FIG. 23 ;

FIG. 30 is a perspective view of a flexible printed circuit board, coilsand an electronic component of the driving part in FIG. 23 ;

FIG. 31 is a perspective and partial view of a driving part and a metalcomponent of the compact camera module according to anotherconfiguration of the 2nd embodiment of the present disclosure;

FIG. 32 is a top view of the controllable aperture stop of the compactcamera module in a maximum aperture state according to the 2ndembodiment of the present disclosure;

FIG. 33 is a top view of the controllable aperture stop of the compactcamera module in another aperture state according to the 2nd embodimentof the present disclosure;

FIG. 34 is a top view of the controllable aperture stop of the compactcamera module in another aperture state according to the 2nd embodimentof the present disclosure;

FIG. 35 is one perspective view of an electronic device according to the3rd embodiment of the present disclosure;

FIG. 36 is another perspective view of the electronic device in FIG. 35;

FIG. 37 is a block diagram of the electronic device in FIG. 35 ;

FIG. 38 shows an image captured by the electronic device using awide-angle compact camera module in FIG. 35 ;

FIG. 39 shows an image captured by the electronic device using a compactcamera module having controllable aperture stop in FIG. 35 with anF-number of 1.4;

FIG. 40 shows an image captured by the electronic device using a compactcamera module having controllable aperture stop in FIG. 35 with anF-number of 5.6;

FIG. 41 is a schematic view of an electrical connection of a drivercontroller, a position sensor and coils according to one embodiment ofthe present disclosure;

FIG. 42 is a schematic view of an electrical connection of a drivercontroller and coils according to one embodiment of the presentdisclosure; and

FIG. 43 is a block diagram of a feedback control system of the drivercontroller, the coils and a position sensing circuit in FIG. 41 or FIG.42 .

DETAILED DESCRIPTION

In the following detailed description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of the disclosed embodiments. It will be apparent,however, that one or more embodiments may be practiced without thesespecific details. In other instances, well-known structures and devicesare schematically shown in order to simplify the drawing.

The present disclosure provides a controllable aperture stop. Thecontrollable aperture stop includes a light pass portion, a fixedportion and a driving part. The light pass portion includes a pluralityof movable blades, and the movable blades together surround a light passaperture. The fixed portion has a plurality of shaft structuresrespectively disposed corresponding to the movable blades. The drivingpart includes a rotatable element and a first magnet. The rotatableelement is rotatable around the light pass aperture and connected to themovable blades, and the rotatable element is configured to drive themovable blades to rotate respectively relative to the shaft structuresso as to adjust the size of the light pass aperture. In addition, thefirst magnet is disposed on the rotatable element so as to prevent abacklash between mechanical parts, thereby increasing the dimensionalaccuracy of the light pass aperture.

The driving part can further include a first coil disposed correspondingto the first magnet. In addition, the first coil is located farther awayfrom the light pass aperture than the first magnet to the light passaperture, so that the overlapping between components can be reduced,thereby allowing the components to be more easily positioned duringassembling and reducing the height of the controllable aperture stop ina direction of a central axis of the light pass aperture. Moreover, thefirst magnet and the first coil are configured to drive the rotatableelement to rotate around the light pass aperture. Moreover, when afarthest distance between the first magnet and the central axis of thelight pass aperture is rm, and a shortest distance between the firstcoil and the central axis is rc, the following condition can besatisfied: 0.5≤rm/rc<1. Therefore, a proper corresponsive positionbetween the first magnet and the first coil is favorable for theoperation of the driving part. Moreover, the following condition canalso be satisfied: 0.8≤rm/rc≤0.99. Moreover, the following condition canalso be satisfied: 0.9≤rm/rc≤0.97. Please refer to FIG. 14 , which showsa schematic view of rm and rc according to the 1st embodiment of thepresent disclosure. Said farthest distance between the first magnet andthe central axis can refer to a distance between one side of the firstmagnet located farthest away from the light pass aperture and thecentral axis of the light pass aperture.

The controllable aperture stop can further include a plurality ofrollable elements, and the rollable elements are disposed between thefixed portion and the rotatable element and arranged around the lightpass aperture, so that the rotatable element is rotatable relative tothe fixed portion. Moreover, the rollable elements can be, for example,balls, cylinders or frustums, but the present disclosure is not limitedthereto. Furthermore, the rollable elements can be made of materials,such as metal, ceramic or plastic materials, but the present disclosureis not limited thereto. Moreover, when a shortest distance between therollable elements and the central axis is rb, and the farthest distancebetween the first magnet and the central axis is rm, the followingcondition can be satisfied: 0.6≤rb/rm≤1.8. Therefore, a propercorresponsive position between the first magnet and the rollableelements is favorable for preventing deformation of the rotatableelement caused by the first magnet. Moreover, the following conditioncan also be satisfied: 0.7≤rb/rm≤1.5. Moreover, the following conditioncan also be satisfied: 0.8≤rb/rm≤1.2. Please refer to FIG. 14 , whichshows a schematic view of rb and rm according to the 1st embodiment ofthe present disclosure.

The fixed portion can include a frame element in physical contact withthe rollable elements so as to support the rollable elements and therotatable element. The frame element can have a through hole disposedcorresponding to the light pass aperture. In addition, the frame elementcan include a metal component and a clad component, and the metalcomponent is insert-molded with the clad component to together form theframe element. The metal component is configured to enhance themechanical strength of the frame element, so that the frame element cancarry the rollable elements and the rotatable element, and the size ofthe frame element can be reduced. The metal component can have aplurality of filled holes, and the clad component is filled into thefilled holes. The filled holes are configured to increase the moldingaccuracy of the frame element so as to prevent misalignment and warpageof the metal component. Moreover, the clad component can be made of, forexample, plastic or ceramic materials, but the present disclosure is notlimited thereto. Moreover, the filled holes and the first magnet may notoverlap with each other in the direction parallel to the central axis ofthe light pass aperture, such that the filled holes are notcorresponding to the first magnet, thereby preventing influences on theuniformity of the magnetic field of the first magnet. Moreover, thefilled holes can be half holes or full holes. Moreover, the shape ofeach of the filled holes can be circular, oval, oblong, C-shaped orU-shaped according to actual design requirements, and the presentdisclosure is not limited thereto. Moreover, the filled holes can be,for example, through holes or blind holes.

The frame element of the fixed portion can have a plurality of recesses,and a part of the metal component is exposed by the recesses. Therefore,it is favorable for positioning the metal component. In addition, therecesses are respectively disposed corresponding to the filled holes ofthe metal component, and the filled holes are respectively partiallyexposed by the recesses. Therefore, the filled holes of the metalcomponent can be in contact with the mold so as to increase the flatnessof the metal component. Furthermore, the recesses can be, for example,ejection holes disposed corresponding to ejector pins of a mold, so thatthe demolding force can be applied on the metal component during thedemolding process of the frame element, thereby reducing deformation ofthe frame element. Moreover, the filled holes can be disposedcorresponding to the ejection holes so as to reduce the number of holes(e.g., recesses) of the clad component, thereby reducing defect rate.

The metal component can include an attraction portion. The attractionportion is ferromagnetic and disposed corresponding to the first magnetso as to generate a magnetic attraction, and the magnetic attractionforces the first magnet and the rotatable element to exert a pressure onthe rollable elements. Therefore, the vibration of the rollable elementsand the rotatable element in the direction parallel to the central axisof the light pass aperture can be reduced so as to stabilize the drivingprocess and thus, prevent misalignment of the rotatable element. In someconfigurations, the metal component can be made of ferromagneticmaterial, such that the entire metal component is ferromagnetic;furthermore, the metal component is disposed corresponding to the firstmagnet so as to generate a magnetic attraction, and the magneticattraction forces the first magnet and the rotatable element to exert apressure on the rollable elements so as to reduce the vibration of therollable elements and the rotatable element in the direction parallel tothe central axis of the light pass aperture, thereby stabilizing thedriving process and therefore preventing misalignment of the rotatableelement. Moreover, the magnetic field direction generated by the firstcoil is different from the attraction direction between the metalcomponent and the first magnet so as to prevent the pressure maintainingthe rollable elements from being changed during the movement of therotatable element, such that the rotatable element can move stably.Moreover, the filled holes and the first magnet may not overlap witheach other in the direction parallel to the central axis of the lightpass aperture, so that the filled holes and the first magnet do notcorrespond to each other, thereby ensuring the uniformity of themagnetic attraction.

The first magnet can include a first surface, a second surface and aconnection surface. The first surface faces the first coil, the secondsurface is located closer to the light pass aperture than the firstsurface to the light pass aperture, and the connection surface isconnected to the first surface and the second surface. Moreover, theattraction portion of the metal component is disposed corresponding tothe connection surface. Through the magnetic circuit arrangement, thepressure exerted on the rollable elements may not be influenced by themagnetic field change of the first coil, thereby stabilizing the drivingprocess.

The driving part can further include an electronic component, and theelectronic component has a position sensing circuit configured to obtainthe position information of the rotatable element. The electroniccomponent is disposed corresponding to the first magnet, and theelectronic component is located farther away from the light passaperture than the first magnet to the light pass aperture, so that theoverlapping between components can be reduced, thereby allowing thecomponents to be more easily positioned during assembling and reducingthe height of the controllable aperture stop in the direction of thecentral axis of the light pass aperture. Moreover, when the farthestdistance between the first magnet and the central axis of the light passaperture is rm, and a shortest distance between the electronic componentand the central axis is rp, the following condition can be satisfied:0.5≤rm/rp<1. Therefore, a proper corresponsive position between thefirst magnet and the electronic component is favorable for ensuringnormal operation of the driving part. Moreover, the following conditioncan also be satisfied: 0.8≤rm/rp≤0.99. Moreover, the following conditioncan also be satisfied: 0.9≤rm/rp≤0.97. Please refer to FIG. 14 , whichshows a schematic view of rm and rp according to the 1st embodiment ofthe present disclosure. In some configurations, the electronic componentcan be a driver controller, and the driver controller is electricallyconnected to the first coil so as to control the first coil to generatea desired magnet field. Therefore, the driver controller being disposedin the controllable aperture stop is favorable for reducing the numberof required cables connected to external components, thereby simplifyingmanufacturing process.

The fixed portion can further include a shaft element, and the shaftelement has the shaft structures. The shaft element and the frameelement of the fixed portion are fixed to each other, and the rollableelements are disposed between the frame element and the rotatableelement. Moreover, the shaft structures and the rollable elements arerespectively disposed on the shaft element and the frame element,preventing the assembling errors from influencing the dimensionalaccuracy of the light pass aperture.

The frame element can further include a curved installation structure,and at least one of the rollable elements is disposed on the curvedinstallation structure and movable along the curved installationstructure in a direction around the light pass aperture. Therefore, adegree of freedom of movement of the rotatable element around the lightpass aperture can be provided, and the movement of the rotatable elementin a direction perpendicular to the central axis of the light passaperture can be reduced, thereby increasing the movement stabilizationof the rotatable element.

The fixed portion can further include a cover, and the movable bladesare disposed between the cover and the rotatable element. Therefore, itis favorable for reducing misalignment of the movable blades in thedirection parallel to the central axis of the light pass aperture so asto ensure the quality of the light pass aperture. Moreover, the covercan include a positioning hole, and the positioning hole is disposedcorresponding to one of the shaft structures. Therefore, it is favorablefor the cover to be positioned in a specific position. In someconfigurations, the cover can include a plurality of positioning holes,and the positioning holes are respectively disposed corresponding to theshaft structures. Moreover, the positioning hole can be, for example, athrough hole or a blind hole.

The cover can further include an inner surface facing the movableblades. Moreover, an arithmetic average roughness (Ra) of the innersurface can be smaller than 0.25 μm. Therefore, it is favorable forreducing the friction between the cover and the movable blades so as toextend the service life of the controllable aperture stop. Moreover, thearithmetic average roughness (Ra) of the inner surface can also besmaller or equal to 0.2 μm. Moreover, the arithmetic average roughness(Ra) of the inner surface can also be smaller or equal to 0.17 μm.

The cover can further include an outer surface, and the outer surface islocated farther away from the movable blades than the inner surface tothe movable blades. In addition, a reflectivity of the outer surface issmaller than a reflectivity of the inner surface. Therefore, it isfavorable for improving assembling efficiency so as to prevent the coverfrom being installed in a wrong direction, and reducing reflection oflight on the outer surface so as to ensure the appearance and preventglare. Furthermore, the outer surface can have various roughnesses toachieve a low reflectivity feature, or the outer surface can be providedwith a low reflection layer, anti-reflection layer or light absorbinglayer to achieve a low reflectivity feature but the present disclosureis not limited thereto.

The first magnet can be in an arc shape, and a direction of the arcshape corresponds to a rotation direction of the first magnet.Therefore, it is favorable for reducing the distance change between thefirst magnet and the first coil during movement so as to stabilize themagnetic field generated by the first magnet and the first coil.

The fixed portion can further include a top contact surface, and themovable blades are disposed on the top contact surface. Moreover, anarithmetic average roughness (Ra) of the top contact surface can besmaller or equal to 0.25 μm. Therefore, it is favorable for reducing thefriction between the top contact surface and the movable blades so as toextend the service life of the controllable aperture stop. Moreover, thearithmetic average roughness (Ra) of the top contact surface can also besmaller or equal to 0.2 μm. Moreover, the arithmetic average roughness(Ra) of the top contact surface can also be smaller or equal to 0.17 μm.

The rotatable element can include a bottom contact surface, and themovable blades are disposed on the bottom contact surface. Moreover, anarithmetic average roughness (Ra) of the bottom contact surface can besmaller than 0.25 μm. Therefore, it is favorable for reducing thefriction between the bottom contact surface and the movable blades so asto extend the service life of the controllable aperture stop.

The driving part can further include a driver controller electricallyconnected to the first coil so as to control the first coil to generatea required magnetic field. Therefore, the driver controller beingdisposed in the controllable aperture stop is favorable for reducing thenumber of required cables connected to external components, therebysimplifying manufacturing process.

The driver controller can have a position sensing circuit configured toobtain the position information of the rotatable element. Therefore, thefunction of position sensing being integrated into the driver controlleris favorable for reducing the number of electronic component so as toimprove assembling efficiency. Furthermore, the position sensingfunction of the position sensing circuit can be achieved by sensing themagnetic field change, and said magnetic field can be generated bymagnets, but the present disclosure is not limited thereto. In otherconfigurations, the position sensing function of the position sensingcircuit can also be achieved by sensing light rays or sound signals, andthe present disclosure is not limited thereto.

The plurality of movable blades can consist of a first blade assemblyand a second blade assembly, the first blade assembly includes some ofthe movable blades, and the second blade assembly includes the other ofthe movable blades. Moreover, in the direction parallel to the centralaxis, the movable blades of the first blade assembly do not overlap withone another, the movable blades of the second blade assembly do notoverlap with one another, and the first blade assembly and the secondblade assembly at least partially overlap with each other. Moreover, inthe direction around the light pass aperture, the movable blades of thefirst blade assembly at least partially overlap with one another, themovable blades of the second blade assembly at least partially overlapwith one another, and the first blade assembly and the second bladeassembly do not overlap with each other. Therefore, it is favorable forpreventing friction between edges of the movable blades when the movableblades move so as to prevent wear of the movable blades, therebyextending the service life of the movable blades.

The driving part can further include a second magnet, and the secondmagnet and the first magnet are symmetrically arranged. Moreover, thedriving part can further include a second coil, and the second magnetand the second coil are disposed symmetrical to the first magnet and thefirst coil. Therefore, it is favorable for balancing the force so as toprevent movement of the rotatable element in the direction perpendicularto the central axis, thereby increasing the stability of the rotatableelement.

When the controllable aperture stop is in a maximum aperture state, adifference between a farthest distance between a periphery of the lightpass aperture and the central axis of the light pass aperture and ashortest distance between the periphery of the light pass aperture andthe central axis of the light pass aperture can be smaller than 9.8%.Therefore, it is favorable for preventing glare caused by an unsmoothshape of light pass aperture, thereby ensuring optical quality.Moreover, when the controllable aperture stop is in the maximum aperturestate, the difference between the farthest distance and the shortestdistance between the periphery of the light pass aperture and thecentral axis of the light pass aperture can also be smaller than 7.4%.Furthermore, in a configuration where the light pass aperture iscircular when the controllable aperture stop is in the maximum aperturestate, distances between the periphery of the light pass aperture andthe central axis are the same, and said distance between the peripheryof the light pass aperture and the central axis is a radius of the lightpass aperture.

The present disclosure provides a compact camera module including theaforementioned controllable aperture stop, and the controllable aperturestop is disposed on an aperture position of the compact camera module.In addition, when a focal length of the compact camera module is f, andan aperture area of the light pass aperture is a1, the followingcondition can be satisfied: 1.19≤f/√(a1)≤11.99.

The present disclosure provides an electronic device including theaforementioned compact camera module.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a perspective view of a compact camera module according to the1st embodiment of the present disclosure, FIG. 2 is an exploded view ofthe compact camera module in FIG. 1 , FIG. 3 is a sectional view of acontrollable aperture stop and a lens assembly of the compact cameramodule in FIG. 1 , FIG. 4 is a side view of the controllable aperturestop and the lens assembly of the compact camera module in FIG. 3 , FIG.5 is an exploded view of the controllable aperture stop of the compactcamera module in FIG. 1 , FIG. 6 is another exploded view of thecontrollable aperture stop of the compact camera module in FIG. 1 , andFIG. 7 is an exploded view of a light pass portion of the controllableaperture stop in FIG. 5 .

In this embodiment, a compact camera module 1 includes a controllableaperture stop 2, a lens assembly LEA, a lens driving unit DGU and animage sensor ISU. Moreover, the controllable aperture stop 2 is disposedon an aperture position of the compact camera module 1, the lens drivingunit DGU is configured to drive the lens assembly LEA to move along anoptical axis OA of the lens assembly LEA, and the image sensor ISU isdisposed on an image surface IMG of the lens assembly LEA.

The controllable aperture stop 2 includes a light pass portion 21, afixed portion 23, a driving part 25 and a support portion 27.

The light pass portion 21 includes a first blade assembly 211 and asecond blade assembly 212. The first blade assembly 211 includes threemovable blades ASB, and the second blade assembly 212 includes threemovable blades ASB. The movable blades ASB of the first blade assembly211 and the second blade assembly 212 together surround a light passaperture 210. Moreover, the size of the light pass aperture 210 can beadjusted through the rotation of the movable blades ASB driven by thedriving part 25.

As shown in FIG. 6 and FIG. 7 , in a direction of a central axis CA ofthe light pass aperture 210, the movable blades ASB of the first bladeassembly 211 do not overlap with one another, the movable blades ASB ofthe second blade assembly 212 do not overlap with one another, and thefirst blade assembly 211 and the second blade assembly 212 at leastpartially overlap with each other. Furthermore, in a direction aroundthe light pass aperture 210 (e.g., in a circumferential direction of thecentral axis CA), the movable blades ASB of the first blade assembly 211at least partially overlap with one another, the movable blades ASB ofthe second blade assembly 212 at least partially overlap with oneanother, and the first blade assembly 211 and the second blade assembly212 do not overlap with each other. In FIG. 7 , an area of the lightpass aperture 210 is an overlapping area of a projection of an openingsurrounded by the movable blades ASB of the first blade assembly 211 inthe direction of the central axis CA and a projection of an openingsurrounded the movable blades ASB of the second blade assembly 212 inthe direction of the central axis CA. In FIG. 7 , that the light passaperture 210 is separated from the first blade assembly 211 and thesecond blade assembly 212 is only illustrated for descriptive purpose.The light pass aperture 210 is not a real element, but a light permeablehole defined by the movable blades ASB as described above. Moreover,that the controllable aperture stop 2 is disposed on a position wherethe aperture of the compact camera module 1 exists can indicate that thelight pass aperture 210 is disposed on said position for the aperture ofthe compact camera module 1. In addition, the optical axis OA of thelens assembly LEA and the central axis CA of the light pass aperture 210are substantially totally overlapping each other.

The fixed portion 23 includes a shaft element 231 and a frame element233 which are fixed to each other. The shaft element 231 has six shaftstructures 2310, and the shaft structures 2310 are respectively disposedcorresponding to the three movable blades ASB of the first bladeassembly 211 and the three movable blades ASB of the second bladeassembly 212. The frame element 233 has a through hole 2330 disposedcorresponding to the light pass aperture 210, such that the frameelement 233 can be sleeved on the lens assembly LEA.

The driving part 25 includes a rotatable element 251, a flexible printedcircuit board 252, a first magnet 253, a second magnet 254, a first coil255 and a second coil 256.

The rotatable element 251 is rotatable around the light pass aperture210 and connected to the movable blades ASB, and the rotatable element251 is configured to drive the movable blades ASB to rotate respectivelyrelative to the shaft structures 2310 so as to adjust the size of thelight pass aperture 210. In detail, please refer to FIG. 6 and FIG. 8 ,where FIG. 8 is an exploded view of a shaft element of a fixed portion,a rotatable element of a driving part and one movable blade of the lightpass portion in FIG. 5 . The first blade assembly 211 and the secondblade assembly 212 are disposed between the shaft element 231 and therotatable element 251. The fixed portion 23 further includes three firsttop contact surfaces TS1 and three second top contact surfaces TS2. Thefirst top contact surfaces TS1 and the second top contact surfaces TS2are located at the shaft element 231 and face the movable blades ASB.There is a step between the first top contact surfaces TS1 and thesecond top contact surfaces TS2, and the first top contact surfaces TS1and the second top contact surfaces TS2 are arranged in a staggeredmanner around the central axis CA. The rotatable element 251 includesthree first bottom contact surfaces BS1, three second bottom contactsurfaces BS2 and six connection protrusions 2510. The first bottomcontact surfaces BS1 and the second bottom contact surfaces BS2 face themovable blades ASB, and there is a step between the first bottom contactsurfaces BS1 and the second bottom contact surfaces BS2. The firstbottom contact surfaces BS1 and the second bottom contact surfaces BS2are arranged in a staggered manner around the central axis CA. Theconnection protrusions 2510 are respectively disposed corresponding tothe three movable blades ASB of the first blade assembly 211 and thethree movable blades ASB of the second blade assembly 212. The movableblades ASB of the first blade assembly 211 are disposed between thefirst top contact surfaces TS1 and the first bottom contact surfacesBS1, and the movable blades ASB of the second blade assembly 212 aredisposed between the second top contact surfaces TS2 and the secondbottom contact surfaces BS2. Moreover, each of the movable blades ASBhas a shaft structure corresponsive hole CH1 and a protrusioncorresponsive groove CH2. The shaft structures 2310 of the shaft element231 are respectively disposed through the shaft structure corresponsiveholes CH1 of the movable blades ASB, such that the movable blades ASBcan be rotated respectively around the shaft structures 2310 as rotationaxes. The connection protrusions 2510 of the rotatable element 251 arerespectively slidably disposed in the protrusion corresponsive groovesCH2 of the movable blades ASB, so that the rotatable element 251 candrive the movable blades ASB to rotate respectively around the shaftstructures 2310 as rotation axes so as to adjust the size of the lightpass aperture 210.

In this embodiment, the number of the movable blades ASB is six, but thepresent disclosure is not limited thereto. In other embodiments, thenumber of movable blades may be, for example, four or eight, and thenumbers of shaft structures, connection protrusions and contact surfacesmay be corresponsive.

In this embodiment, an arithmetic average roughness (Ra) of each of thefirst top contact surfaces TS1 and the second top contact surfaces TS2of the fixed portion 23 can be smaller or equal to 0.25 μm, and anarithmetic average roughness (Ra) of each of the first bottom contactsurfaces BS1 and the second bottom contact surfaces BS2 of the rotatableelement 251 can be smaller than 0.25 μm.

The flexible printed circuit board 252 is arranged around the rotatableelement 251. The first magnet 253 and the second magnet 254 are disposedon a side wall SLO of the rotatable element 251 extending in thedirection of the central axis CA, and the first coil 255 and the secondcoil 256 are disposed on the flexible printed circuit board 252 andelectrically connected to the flexible printed circuit board 252,thereby improving assembling yield rate. The first coil 255 and thesecond coil 256 respectively correspond to the first magnet 253 and thesecond magnet 254 so as to increase space utilization, thereby reducingthe thickness of the controllable aperture stop 2. Moreover, the firstcoil 255 is located farther away from the light pass aperture 210 thanthe first magnet 253 to the light pass aperture 210, and the second coil256 is located farther away from the light pass aperture 210 than thesecond magnet 254 to the light pass aperture 210. The first magnet 253,the second magnet 254, the first coil 255 and the second coil 256 areconfigured to drive the rotatable element 251 to rotate around the lightpass aperture 210. In this embodiment, the second magnet 254 and thesecond coil 256 are disposed symmetrical to the first magnet 253 and thefirst coil 255.

The support portion 27 includes four rollable elements 270, and therollable elements 270 are disposed between the fixed portion 23 and therotatable element 251 and arranged around the light pass aperture 210.In detail, the frame element 233 of the fixed portion 23 further hasfour curved installation structures AMS, the rollable elements 270 arerespectively disposed on the curved installation structures AMS of theframe element 233 and movable along the curved installation structuresAMS in the direction around the light pass aperture 210, and the frameelement 233 is in physical contact with the rollable elements 270 so asto support the rollable elements 270 and the rotatable element 251, suchthat the rotatable element 251 is rotatable relative to the fixedportion 23 in the circumferential direction of the central axis CA. Inthis embodiment, the curved installation structures AMS of the frameelement 233 are arc-shaped recesses, but the present disclosure is notlimited thereto. The rollable elements 270 are balls, and are made ofmetal material, ceramic material or plastic material. In thisembodiment, the shaft structures 2310 and the rollable elements 270 arerespectively disposed on the shaft element 231 and the frame element233.

Please refer to FIG. 9 to FIG. 13 . FIG. 9 is a perspective view of therollable elements and the frame element of the fixed portion in FIG. 5 ,FIG. 10 is an enlarged top view of region EL1 in FIG. 9 , FIG. 11 isanother perspective view of the frame element of the fixed portion inFIG. 5 , FIG. 12 is a sectional view of the frame element in FIG. 11 ,and FIG. 13 is a schematic view of the relative position of a metalcomponent of the frame element of the fixed portion and the magnets ofthe driving part in FIG. 5 .

In this embodiment, the frame element 233 includes a metal component2331 and a clad component 2332, and the metal component 2331 isinsert-molded with the clad component 2332 to together form the frameelement 233. The metal component 2331 has a plurality of filled holesMFH, and the filled holes MFH are full holes and are circular throughholes. The clad component 2332 is, for example, made of plastic materialor ceramic material, and the clad component 2332 is filled into thefilled holes MFH of the metal component 2331.

The frame element 233 further has a plurality of recesses PCG located atthe clad component 2332, and a part of the metal component 2331 isexposed by the recesses PCG. Moreover, the recesses PCG are respectivelydisposed corresponding to the filled holes MFH of the metal component2331 so as to reduce the number of holes (e.g., the recesses PCG) of theclad component 2332, and the filled holes MFH are respectively partiallyexposed by the recesses PCG. In this embodiment, the recesses PCG are,for example, ejection holes disposed corresponding to ejector pins of amold.

The metal component 2331 includes two attraction portions MAP which areferromagnetic. The attraction portions MAP are respectively disposedcorresponding to the first magnet 253 and the second magnet 254 so as togenerate a magnetic attraction in a direction DF1, and the magneticattraction forces the first magnet 253, the second magnet 254 and therotatable element 251 to exert a pressure on the rollable elements 270in the direction DF1 so as to maintain the position of the rollableelements 270. In addition, a direction of the magnetic field generatedby the first coil 255 and the second coil 256 is different from thedirection DF1 of the magnetic attraction between the metal component2331 and the magnets. Specifically, each of the first magnet 253 and thesecond magnet 254 includes a first surface MS1, a second surface MS2 anda connection surface MS3. The first surfaces MS1 respectively face thecoils 255 and 256, the second surfaces MS2 are located closer to thelight pass aperture 210 than the first surfaces MS1 to the light passaperture 210, and each of the connection surfaces MS3 is connected tothe corresponding first surface MS1 and second surface MS2. Moreover,the attraction portions MAP of the metal component 2331 respectivelycorrespond to the connection surfaces MS3 of the first magnet 253 andthe second magnet 254. As shown in FIG. 13 , the filled holes MFH of themetal component 2331 do not overlap with the first magnet 253 and thesecond magnet 254 in the direction parallel to the central axis CA, suchthat the filled holes MFH do not correspond to the magnets 253 and 254.In this embodiment, each of the first magnet 253 and the second magnet254 is in an arc shape, and a direction of the arc shape corresponds toa rotation direction of the magnets 253 and 254.

Please refer to FIG. 14 , is a perspective view of the flexible printedcircuit board, coils and electronic component of the driving part inFIG. 5 . The driving part further includes a first electronic component257 and a second electronic component 258. The first electroniccomponent 257 is a driver controller disposed on the flexible printedcircuit board 252 and electrically connected to the second coil 256 andthe first coil 255 via the flexible printed circuit board 252, and thefirst electronic component 257 is configured to control the coils 255and 256 to generate required magnetic fields. The second electroniccomponent 258 is a position sensor, and the position sensor includes aposition sensing circuit configured to obtain the position informationof the rotatable element 251. The second electronic component 258 isdisposed on the flexible printed circuit board 252 and electricallyconnected to the first electronic component 257 (i.e., the drivercontroller) via the flexible printed circuit board 252 so as to achievefeedback control, thereby ensuring the accuracy of size adjustment ofthe controllable aperture stop 2. The electrical connection and feedbackcontrol process of the first electronic component 257, the secondelectronic component 258, the second coil 256 and the first coil 255 inthis embodiment are illustrated in reference to FIG. 41 and FIG. 43 ,where FIG. 41 is a schematic view of an electrical connection of adriver controller, a position sensor and coils according to oneembodiment of the present disclosure, and FIG. 43 is a block diagram ofa feedback control system of the driver controller, the coils and aposition sensing circuit in FIG. 41 . In FIG. 41 , a driver controllerDCU and a position sensor PSU are two separate components and connectedto a power VCC and ground GND. The driver controller DCU is electricallyconnected to coils CL so as to control the coils CL to generate requiredmagnetic fields. One end of each of the coils CL is connected to groundGND. The position sensor PSU has a position sensing circuit PSCconfigured to obtain the position information of a rotatable element andmagnets in a direction around a light pass aperture, and the positionsensor PSU is electrically connected to the driver controller DCU so asto generate signals to the driver controller DCU according to theobtained position information. As shown in FIG. 43 , in a closed loopfeedback control system, the position sensing circuit PSC detects theposition of the magnets on the rotatable element and feedbacks the sameto the driver controller DCU, and therefore, the driver controller DCUmay adjust the magnetic field generated by the coils CL so as to adjustthe position of the rotatable element.

In this embodiment, the first electronic component 257 (i.e., the drivercontroller) is directly disposed on the flexible printed circuit board252 and electrically connected to the second coil 256 and the first coil255 via the flexible printed circuit board 252, but the presentdisclosure is not limited thereto. For example, please refer to FIG. 15, which is a perspective and partial view of a driving part of thecompact camera module according to another configuration of the 1stembodiment of the present disclosure. In other embodiments, a drivingpart 25 a further includes a printed circuit board 259 a, and theprinted circuit board 259 a is electrically connected to a flexibleprinted circuit board 252 a. A first electronic component 257 a (e.g., adriver controller) is disposed on the printed circuit board 259 a andelectrically connected to a first coil 255 a and a second coil 256 a viathe printed circuit board 259 a and the flexible printed circuit board252 a so as to improve assembling process.

In this embodiment, the second electronic component 258 (i.e., theposition sensor) and the first magnet 253 are disposed corresponding toeach other, and the second electronic component 258 is located fartheraway from the light pass aperture 210 than the first magnet 253 to thelight pass aperture 210. In this embodiment, the position sensingcircuit detects the magnetic field change of the first magnet 253 toobtain position information of components.

Please refer to FIG. 16 , which is a cross-sectional view of thecontrollable aperture stop in FIG. 4 .

When a farthest distance between the first magnet 253 and the centralaxis CA is rm, and a shortest distance between the first coil 255 andthe central axis CA is rc, the following conditions are satisfied:rm=4.10 mm; rc=4.22 mm; and rm/rc=0.97. In this embodiment, the distancerelation between the second magnet 254, the second coil 256 and thecentral axis CA can also satisfy the above conditions.

When a shortest distance between the rollable elements 270 and thecentral axis CA is rb, and the farthest distance between the firstmagnet 253 and the central axis CA is rm, the following conditions aresatisfied: rb=3.75 mm; rm=4.10 mm; and rb/rm=0.91.

When the farthest distance between the first magnet 253 and the centralaxis CA is rm, and a shortest distance between the second electroniccomponent 258 and the central axis CA is rp, the following conditionsare satisfied: rm=4.10 mm; rp=4.37 mm; and rm/rp=0.94.

Please refer to FIG. 6 and FIG. 17 to FIG. 19 , where FIG. 17 is a topview of the controllable aperture stop of the compact camera module in amaximum aperture state according to the 1st embodiment of the presentdisclosure, FIG. 18 is a top view of the controllable aperture stop ofthe compact camera module in another aperture state according to the 1stembodiment of the present disclosure, and FIG. 19 is a top view of thecontrollable aperture stop of the compact camera module in anotheraperture state according to the 1st embodiment of the presentdisclosure.

In this embodiment, the size of the light pass aperture 210 can beadjusted by the driving part 25, so that the controllable aperture stop2 can have various aperture states, and thus, the compact camera module1 has different f-numbers.

For example, as shown in FIG. 6 , when the size of the light passaperture 210 is to be enlarged, the first magnet 253, the second magnet254, the first coil 255 and the second coil 256 of the driving part 25together generate a driving force to drive the rotatable element 251 torotate in a rotation direction DF2. At this moment, the rollableelements 270 are driven by the rotatable element 251 to move in thecurved installation structures AMS of the frame element 233 in a rollingdirection DF3. Therefore, the rotatable element 251 is rotatablerelative to the frame element 233 of the fixed portion 23. When therotatable element 251 is rotated in the rotation direction DF2, theconnection protrusions 2510 of the rotatable element 251 drive themovable blades ASB to rotate in a direction DF4 respectively around theshaft structures 2310 of the shaft element 231 as rotation axes, therebyenlarging the size of the light pass aperture 210.

On the other hand, when the size of the light pass aperture 210 is to bereduced, the first magnet 253, the second magnet 254, the first coil 255and the second coil 256 of the driving part 25 together generate adriving force to drive the rotatable element 251 to rotate in adirection opposite to the rotation direction DF2, and the connectionprotrusions 2510 of the rotatable element 251 drive the movable bladesASB to rotate respectively around the shaft structures 2310 of the shaftelement 231 as rotation axes in a direction opposite to the directionDF4, thereby reducing the size of the light pass aperture 210.

FIG. 17 to FIG. 19 respectively show three aperture states of thecontrollable aperture stop 2 in this embodiment.

As shown in FIG. 17 , when the controllable aperture stop 2 is in afirst aperture state, a focal length of the compact camera module 1 isf, and an aperture area of the light pass aperture 210 is a1, thefollowing conditions are satisfied: f=6.19 mm; a1=15.34 mm²; andf/√(a1)=1.58. In the first aperture state, an f-number of the compactcamera module 1 is fno, and the following condition is satisfied:fno=1.4. Moreover, a difference between a farthest distance and ashortest distance between a periphery of the light pass aperture 210 andthe central axis CA is smaller than 9.8%. In this embodiment, the firstaperture state is the maximum aperture state of the controllableaperture stop 2, and the light pass aperture 210 is circular in themaximum aperture state.

As shown in FIG. 18 , when the controllable aperture stop 2 is in asecond aperture state, the focal length of the compact camera module 1is f, and the aperture area of the light pass aperture 210 is a1, thefollowing conditions are satisfied: f=6.19 mm; a1=7.52 mm²; andf/√(a1)=2.26. In the second aperture state, the f-number of the compactcamera module 1 is fno, and the following condition is satisfied:fno=2.0.

As shown in FIG. 19 , when the controllable aperture stop 2 is in athird aperture state, the focal length of the compact camera module 1 isf, and the aperture area of the light pass aperture 210 is a1, thefollowing conditions are satisfied: f=6.19 mm; a1=3.58 mm²; andf/√(a1)=3.27. In the third aperture state, the f-number of the compactcamera module 1 is fno, and the following condition is satisfied:fno=2.9.

2nd Embodiment

FIG. 20 is a perspective view of a compact camera module according tothe 2nd embodiment of the present disclosure, FIG. 21 is a sectionalview of a controllable aperture stop of the compact camera module inFIG. 20 , FIG. 22 is a side view of the controllable aperture stop ofthe compact camera module along line 22-22 in FIG. 21 , FIG. 23 is anexploded view of the controllable aperture stop of the compact cameramodule in FIG. 20 , FIG. 24 is another exploded view of the controllableaperture stop of the compact camera module in FIG. 20 , and FIG. 25 isan exploded view of a light pass portion of the controllable aperturestop in FIG. 23 .

In this embodiment, a compact camera module 1 b includes a controllableaperture stop 2 b, a lens assembly, a lens driving unit and an imagesensor (not shown in figures). Moreover, the controllable aperture stop2 b is disposed on an aperture position of the compact camera module 1b, the lens driving unit is configured to drive the lens assembly tomove along an optical axis of the lens assembly, and the image sensor isdisposed on an image surface of the lens assembly. In addition, thearrangement of the lens assembly, the lens driving unit and the imagesensor of the compact camera module 1 b is the same as that of the lensassembly LEA, the lens driving unit DGU and the image sensor ISU of thecompact camera module 1 as disclosed in the 1st embodiment.

The controllable aperture stop 2 b includes a light pass portion 21 b, afixed portion 23 b, a driving part 25 b and a support portion 27 b.

The light pass portion 21 b includes a first blade assembly 211 b and asecond blade assembly 212 b. The first blade assembly 211 b includesthree movable blades ASB, and the second blade assembly 212 b includesthree movable blades ASB. The movable blades ASB of the first bladeassembly 211 b and the second blade assembly 212 b together surround alight pass aperture 210 b. Moreover, the size of the light pass aperture210 b can be adjusted through the rotation of the movable blades ASBdriven by the driving part 25 b.

As shown in FIG. 24 and FIG. 25 , in a direction of a central axis CA ofthe light pass aperture 210 b, the movable blades ASB of the first bladeassembly 211 b do not overlap with one another, the movable blades ASBof the second blade assembly 212 b do not overlap with one another, andthe first blade assembly 211 b and the second blade assembly 212 b atleast partially overlap with each other. Furthermore, in a directionaround the light pass aperture 210 b (e.g., in a circumferentialdirection of the central axis CA), the movable blades ASB of the firstblade assembly 211 b at least partially overlap with one another, themovable blades ASB of the second blade assembly 212 b at least partiallyoverlap with one another, and the first blade assembly 211 b and thesecond blade assembly 212 b do not overlap with each other. In FIG. 25 ,an area of the light pass aperture 210 b is an overlapping area of aprojection of an opening surrounded by the movable blades ASB of thefirst blade assembly 211 b in the direction of the central axis CA and aprojection of an opening surrounded the movable blades ASB of the secondblade assembly 212 b in the direction of the central axis CA. In FIG. 25, that the light pass aperture 210 b is separated from the first bladeassembly 211 b and the second blade assembly 212 b is only illustratedfor descriptive purpose. The light pass aperture 210 b is not a realelement, but a light permeable hole defined by the movable blades ASB asdescribed above. Moreover, that the controllable aperture stop 2 b isdisposed on a position where the aperture of the compact camera module 1b exists can indicate that the light pass aperture 210 b is disposed onsaid position for the aperture of the compact camera module 1 b. Inaddition, the optical axis of the lens assembly and the central axis CAof the light pass aperture 210 b are substantially totally overlappingeach other.

The fixed portion 23 b includes a shaft element 231 b, a frame element233 b and a cover 235 b which are fixed to one another. The shaftelement 231 b has six shaft structures 2310 b, and the shaft structures2310 b are respectively disposed corresponding to the three movableblades ASB of the first blade assembly 211 b and the three movableblades ASB of the second blade assembly 212 b. The frame element 233 bhas through hole 2330 b disposed corresponding to the light passaperture 210 b, such that the frame element 233 b can be sleeved on thelens assembly. The cover 235 b includes six positioning holes 2350 b,and the positioning holes 2350 b are respectively disposed correspondingto the shaft structures 2310 b.

The driving part 25 b includes a rotatable element 251 b, a flexibleprinted circuit board 252 b, a first magnet 253 b, a second magnet 254b, a first coil 255 b and a second coil 256 b.

The rotatable element 251 b is rotatable around the light pass aperture210 b and connected to the movable blades ASB, and the rotatable element251 b is configured to drive the movable blades ASB to rotaterespectively relative to the shaft structures 2310 b the light passaperture 210 b. In detail, the first blade assembly 211 b and the secondblade assembly 212 b are disposed between the cover 235 b and therotatable element 251 b. The rotatable element 251 b includes sixconnection protrusions 2510 b, and the connection protrusions 2510 b arerespectively disposed corresponding to the three movable blades ASB ofthe first blade assembly 211 b and the three movable blades ASB of thesecond blade assembly 212 b. Moreover, each of the movable blades ASBhas a shaft structure corresponsive hole CH1 and a protrusioncorresponsive groove CH2. The shaft structures 2310 b of the shaftelement 231 b are respectively disposed through the shaft structurecorresponsive holes CH1 of the movable blades ASB and fixed to thepositioning holes 2350 b of the cover 235 b, such that the movableblades ASB can be rotated respectively around the shaft structures 2310b as rotation axes. Therefore, the cover 235 b is maintained in apredetermined position, and with the collaboration of the cover 235 band the rotatable element 251 b, the movable blades ASB are movable in acertain range. The connection protrusions 2510 b of the rotatableelement 251 b are respectively slidably disposed in the protrusioncorresponsive grooves CH2 of the movable blades ASB, so that therotatable element 251 b can drive the movable blades ASB to rotaterespectively around the shaft structures 2310 b as rotation axes so asto adjust the size of the light pass aperture 210 b. In this embodiment,the positioning holes 2350 b are through holes.

In this embodiment, the number of the movable blades ASB is six, but thepresent disclosure is not limited thereto. In other embodiments, thenumber of movable blades may be, for example, four or eight, and thenumbers of shaft structures, connection protrusions and positioningholes may be corresponsive.

In this embodiment, the cover 235 b further includes an inner surface2351 b and an outer surface 2352 b. The inner surface 2351 b faces themovable blades ASB, and the outer surface 2352 b is located farther awayfrom the movable blades ASB than the inner surface 2351 b to the movableblades ASB. Moreover, a reflectivity of the outer surface 2352 b issmaller than a reflectivity of the inner surface 2351 b. An arithmeticaverage roughness (Ra) of the inner surface 2351 b is smaller than 0.25μm.

The flexible printed circuit board 252 b is arranged around therotatable element 251 b. The first magnet 253 b and the second magnet254 b are disposed on a side wall SLO of the rotatable element 251 b inthe direction of the central axis CA, and the first coil 255 b and thesecond coil 256 b are disposed on the flexible printed circuit board 252b and electrically connected to the flexible printed circuit board 252b, thereby improving assembling yield rate. The first coil 255 b and thesecond coil 256 b respectively correspond to the first magnet 253 b andthe second magnet 254 b. Moreover, the first coil 255 b is locatedfarther away from the light pass aperture 210 b than the first magnet253 b to the light pass aperture 210 b, and the second coil 256 b islocated farther away from the light pass aperture 210 b than the secondmagnet 254 b to the light pass aperture 210 b. The first magnet 253 b,the second magnet 254 b, the first coil 255 b and the second coil 256 bare configured to drive the rotatable element 251 b to rotate around thelight pass aperture 210 b. In this embodiment, the second magnet 254 band the second coil 256 b are disposed symmetrical to the first magnet253 b and the first coil 255 b.

The support portion 27 b includes four rollable elements 270 b, and therollable elements 270 b are disposed between the fixed portion 23 b andthe rotatable element 251 b and arranged around the light pass aperture210 b. In detail, the frame element 233 b of the fixed portion 23 bfurther has four curved installation structures AMS, the rollableelements 270 b are respectively disposed on the curved installationstructures AMS of the frame element 233 b and movable along the curvedinstallation structures AMS in the direction around the light passaperture 210 b, and the frame element 233 b is in physical contact withthe rollable elements 270 b so as to support the rollable elements 270 band the rotatable element 251 b, such that the rotatable element 251 bis rotatable relative to the fixed portion 23 b in the circumferentialdirection of the central axis CA. In this embodiment, the curvedinstallation structures AMS of the frame element 233 b are arc-shapedrecesses, but the present disclosure is not limited thereto. Therollable elements 270 b are balls, and are made of metal material,ceramic material or plastic material. In this embodiment, the shaftstructures 2310 b and the rollable elements 270 b are respectivelydisposed on the shaft element 231 b and the frame element 233 b.

Please refer to FIG. 26 to FIG. 29 . FIG. 26 is a perspective view ofthe rollable elements and the frame element of the fixed portion in FIG.23 , FIG. 27 is an enlarged top view of region EL2 in FIG. 26 , FIG. 28is another perspective view of the frame element of the fixed portion inFIG. 23 , and FIG. 29 is a schematic view of the relative position of ametal component of the frame element of the fixed portion and themagnets of the driving part in FIG. 23 .

In this embodiment, the frame element 233 b includes a metal component2331 b and a clad component 2332 b, and the metal component 2331 b isinsert-molded with the clad component 2332 b to together form the frameelement 233 b. The metal component 2331 b has a plurality of filledholes MFHH, and the filled holes MFHH are half holes. The clad component2332 b is, for example, made of plastic material or ceramic material,and the clad component 2332 b is filled into the filled holes MFHH ofthe metal component 2331 b.

The frame element 233 b further has a plurality of recesses PCG locatedat the clad component 2332 b, and a part of the metal component 2331 bis exposed by the recesses PCG so as to position the metal component2331 b. Moreover, the recesses PCG are respectively disposedcorresponding to the filled holes MFHH of the metal component 2331 b soas to reduce the number of holes (e.g., the recesses PCG) of the cladcomponent 2332 b, and the filled holes MFHH are respectively partiallyexposed by the recesses PCG. In this embodiment, the recesses PCG are,for example, ejection holes disposed corresponding to ejector pins of amold.

The metal component 2331 b is ferromagnetic, the metal component 2331 b,the first magnet 253 b and the second magnet 254 b together generate amagnetic attraction in a direction DF1, and the magnetic attractionforces the first magnet 253 b, the second magnet 254 b and the rotatableelement 251 b to exert a pressure on the rollable elements 270 b in thedirection DF1 so as to maintain the position of the rollable elements270 b. In addition, a direction of the magnetic field generated by thefirst coil 255 b and the second coil 256 b is different from thedirection DF1 of the magnetic attraction between the metal component2331 b and the magnets. As shown in FIG. 29 , the filled holes MFHH ofthe metal component 2331 b do not overlap with the first magnet 253 band the second magnet 254 b in the direction parallel to central axisCA, such that the filled holes MFHH do not correspond to the magnets 253b and 254 b.

Please refer to FIG. 30 , which is a perspective view of the flexibleprinted circuit board, the coils and an electronic component of thedriving part in FIG. 23 . The driving part 25 b further includes a thirdelectronic component 257 b, and the third electronic component 257 b isa driver controller having a position sensing circuit, therebysimplifying cable arrangement. The third electronic component 257 b isdisposed on the flexible printed circuit board 252 b and electricallyconnected to the first coil 255 b and the second coil 256 b via theflexible printed circuit board 252 b, and the third electronic component257 b is configured to control the coils 255 b and 256 b to generaterequired magnetic fields. Moreover, the third electronic component 257 bis disposed corresponding to the first magnet 253 b so as to obtain theposition information of the rotatable element 251 b and the first magnet253 b in the direction around the light pass aperture 210 b through theposition sensing circuit, thereby achieving feedback control so as toensure the accuracy of size adjustment of the controllable aperture stop2 b. The electrical connection and feedback control process of the thirdelectronic component 257 b, the first coil 255 b and the second coil 256b in this embodiment are illustrated in reference to FIG. 42 and FIG. 43, where FIG. 42 is a schematic view of an electrical connection of adriver controller and coils according to one embodiment of the presentdisclosure, and FIG. 43 is a block diagram of a feedback control systemof the driver controller, the coils and a position sensing circuit inFIG. 42 . In FIG. 42 , a driver controller DCU has a position sensingcircuit PSC, and the driver controller DCU and the position sensingcircuit PSC are connected to a power VCC and GND. The driver controllerDCU is electrically connected to coils CL so as to control the coils CLto generate required magnetic fields. One end of each of the coils CL isconnected to ground GND. The position sensing circuit PSC of the drivercontroller DCU is configured to obtain the position information of arotatable element and magnets in a direction around a light passaperture. As shown in FIG. 43 , in a closed loop feedback controlsystem, the position sensing circuit PSC detects the position of themagnets on the rotatable element and feedbacks the same to the drivercontroller DCU, and therefore, the driver controller DCU may adjust themagnetic field generated by the coils CL so as to adjust the position ofthe rotatable element.

In this embodiment, the third electronic component 257 b is disposedcorresponding to the first magnet 253 b, and the third electroniccomponent 257 b is located farther away from the light pass aperture 210b than the first magnet 253 b to the light pass aperture 210 b. In thisembodiment, the position sensing circuit detects the magnetic fieldchange of the first magnet 253 b to obtain position information ofcomponents.

In this embodiment, the number of magnets of the driving part 25 b istwo, the third electronic component 257 b is disposed corresponding tothe first magnet 253 b, and the metal component 2331 b is made offerromagnetic material such that the whole metal component 2331 b isferromagnetic, but the present disclosure is not limited thereto. Forexample, please refer to FIG. 31 , which is a perspective and partialview of a driving part and a metal component of the compact cameramodule according to another configuration of the 2nd embodiment of thepresent disclosure. In other embodiments, the number of magnets of adriving part 25 c is four; that is, the driving part 25 c furtherincludes a third magnet 353 c and a fourth magnet 354 c disposed on theside wall of a rotatable element, and the third magnet 353 c and thefourth magnet 354 c are respectively disposed between a first magnet 253c and a second magnet 254 c, such that the first magnet 253 c, thesecond magnet 254 c, the third magnet 353 c and the fourth magnet 354 ctogether surround the rotatable element. Moreover, a third electroniccomponent 257 c disposed on a flexible printed circuit board 252 c isdisposed corresponding to the third magnet 353 c, and the thirdelectronic component 257 c is configured to detect the magnetic fieldchange of the third magnet 353 c through a position sensing circuitthereof so as to obtain the position information of the rotatableelement and the third magnet 353 c in a direction around the light passaperture. In addition, a metal component 2331 c is not entirelyferromagnetic but includes two attraction portions MAP that areferromagnetic at some portions thereof. The attraction portions MAP arerespectively disposed corresponding to the third magnet 353 c and thefourth magnet 354 c so as to together generate a magnetic attraction inthe direction DF1, and the magnetic attraction forces the third magnet353 c, the fourth magnet 354 c and the rotatable element to exert apressure on rollable elements in the direction DF1 so as to stabilizethe operation process.

When a shortest distance between the first magnet 253 b and the centralaxis CA is rm, and a shortest distance between the first coil 255 b andthe central axis CA is rc, the following conditions are satisfied:rm=4.12 mm; rc=4.31 mm; and rm/rc=0.96. In this embodiment, the distancerelation between the second magnet 254 b, the second coil 256 b and thecentral axis CA can also satisfy the above conditions.

When a shortest distance between the rollable elements 270 b and thecentral axis CA is rb, and the farthest distance between the firstmagnet 253 b and the central axis CA is rm, the following conditions aresatisfied: rb=3.75 mm; rm=4.12 mm; and rb/rm=0.91.

When the farthest distance between the first magnet 253 b and thecentral axis CA is rm, and a shortest distance between the thirdelectronic component 257 b and the central axis CA is rp, the followingconditions are satisfied: rm=4.12 mm; rp=4.25 mm; and rm/rp=0.97.

Please refer to FIG. 24 and FIG. 32 to FIG. 34 , where FIG. 32 is a topview of the controllable aperture stop of the compact camera module in amaximum aperture state according to the 2nd embodiment of the presentdisclosure, FIG. 33 is a top view of the controllable aperture stop ofthe compact camera module in another aperture state according to the 2ndembodiment of the present disclosure, and FIG. 34 is a top view of thecontrollable aperture stop of the compact camera module in anotheraperture state according to the 2nd embodiment of the presentdisclosure.

In this embodiment, the size of the light pass aperture 210 b can beadjusted by the driving part 25 b, so that the controllable aperturestop 2 b can have various aperture states, and thus, the compact cameramodule 1 b has different f-numbers.

For example, as shown in FIG. 24 , when the size of the light passaperture 210 b is to be reduced, the first magnet 253 b, the secondmagnet 254 b, the first coil 255 b and the second coil 256 b of thedriving part 25 b together generate a driving force to drive therotatable element 251 b to rotate in a rotation direction DF5. At thismoment, the rollable elements 270 b are driven by the rotatable element251 b to move in the curved installation structures AMS of the frameelement 233 b in a rolling direction DF6. Therefore, the rotatableelement 251 b is rotatable relative to the frame element 233 b of thefixed portion 23 b. When the rotatable element 251 b is rotated in therotation direction DF5, the connection protrusions 2510 b of therotatable element 251 b drive the movable blades ASB to rotate in adirection DF7 respectively around the shaft structures 2310 b of theshaft element 231 b as rotation axes, thereby enlarging the size of thelight pass aperture 210 b.

On the other hand, when the size of the light pass aperture 210 b is tobe enlarged, the first magnet 253 b, the second magnet 254 b, the firstcoil 255 b and the second coil 256 b of the driving part 25 b togethergenerate a driving force to drive the rotatable element 251 b to rotatein a direction opposite to the rotation direction DF5, and theconnection protrusions 2510 b of the rotatable element 251 b drive themovable blades ASB to rotate respectively around the shaft structures2310 b of the shaft element 231 b as rotation axes in a directionopposite to the direction DF7, thereby reducing the size of the lightpass aperture 210 b.

FIG. 32 to FIG. 34 respectively show three aperture states of thecontrollable aperture stop 2 b in this embodiment.

As shown in FIG. 32 , when the controllable aperture stop 2 b is in afirst aperture state, a focal length of the compact camera module 1 b isf, and an aperture area of the light pass aperture 210 b is a1, thefollowing conditions are satisfied: f=6.19 mm; a1=15.34 mm²; andf/√(a1)=1.58. In the first aperture state, an f-number of the compactcamera module 1 b is fno, and the following condition is satisfied:fno=1.4. Moreover, a difference between a farthest distance and ashortest distance between a periphery of the light pass aperture 210 band the central axis CA is smaller than 9.8%. In this embodiment, thefirst aperture state is the maximum aperture state of the controllableaperture stop 2 b, and the light pass aperture 210 b in the maximumaperture state.

As shown in FIG. 33 , when the controllable aperture stop 2 b is in asecond aperture state, the focal length of the compact camera module 1 bis f, and the aperture area of the light pass aperture 210 b is a1, thefollowing conditions are satisfied: f=6.19 mm; a1=3.84 mm²; andf/√(a1)=3.16. In the second aperture state, the f-number of the compactcamera module 1 b is fno, and the following condition is satisfied:fno=2.8.

As shown in FIG. 34 , when the controllable aperture stop 2 b is in athird aperture state, the focal length of the compact camera module 1 bis f, and the aperture area of the light pass aperture 210 b is a1, thefollowing conditions are satisfied: f=6.19 mm; a1=0.96 mm²; andf/√(a1)=6.32. In the third aperture state, the f-number of the compactcamera module 1 b is fno, the following condition is satisfied: fno=5.6.

3rd Embodiment

Please refer to FIG. 35 to FIG. 37 . FIG. 35 is one perspective view ofan electronic device according to the 3rd embodiment of the presentdisclosure, FIG. 36 is another perspective view of the electronic devicein FIG. 35 , and FIG. 37 is a block diagram of the electronic device inFIG. 35 .

In this embodiment, an electronic device 7 is a mobile device such as acomputer, a smartphone, a smart wearable device, a camera drone, adriving recorder and displayer, and the present disclosure is notlimited thereto. The electronic device 7 includes a compact cameramodule 70 a having a controllable aperture stop, a wide-angle compactcamera module 70 b, a macro-photo compact camera module 70 c, a compactcamera module 70 d, a ToF (time of flight) camera module 70 e, a flashmodule 72, a focus assist module 73, an image signal processor, adisplay module 75, an image software processor and a biometricidentification device 77. In addition, the compact camera module 70 a ahaving controllable aperture stop is, for example, the compact cameramodule 1 as disclosed in the 1st embodiment, but the present disclosureis not limited thereto. Each of the camera modules 70 b, 70 c, 70 d and70 e may be one of the compact camera modules as disclosed in the aboveembodiments of the present disclosure.

The compact camera module 70 a, the compact camera module 70 b and thecompact camera module 70 c are disposed on the same side of theelectronic device 7. The compact camera module 70 d, the ToF cameramodule 70 e and the display module 75 are disposed on the opposite sideof the electronic device 7. The display module 75 can be a userinterface, such that the camera module 70 d and the camera module 70 ecan be front-facing cameras of the electronic device 7 for takingselfies, but the present disclosure is not limited thereto.

In this embodiment, the compact camera module 70 a, the compact cameramodule 70 b and the compact camera module 70 c have different fields ofview, such that the electronic device 7 can have various magnificationratios so as to meet the requirement of optical zoom functionality. Forexample, the wide-angle compact camera module 70 b has a relativelylarge field of view, and the image captured by the wide-angle compactcamera module 70 b can refer to FIG. 38 , which shows an image capturedby the electronic device 7 with a wide-angle compact camera module, andthe captured image as shown in FIG. 38 includes the whole cathedral,surrounding buildings and people in front of the cathedral. The capturedimage as shown in FIG. 38 has a relatively large field of view and depthof view, but it often has a relatively large degree of distortion. Theimage captured by the compact camera module 70 a having a controllableaperture stop with a relatively small f-number can refer to FIG. 39 ,and the image captured by the compact camera module 70 a having acontrollable aperture stop with a relatively large f-number can refer toFIG. 40 . FIG. 39 shows an image captured by the electronic device 7with a compact camera module having a controllable aperture stop with anf-number of 1.4, FIG. 40 shows an image captured by the electronicdevice 7 with a compact camera module having a controllable aperturestop with an f-number of 5.6, and the captured images as shown in FIG.39 and FIG. 40 include birds flying in front of the cathedral. As shownin FIG. 39 , when the controllable aperture stop of the compact cameramodule 70 a provides a relatively large light pass aperture, the imagesensor receives more light, but the background in the image isrelatively blurry. As shown in FIG. 40 , when the controllable aperturestop of the compact camera module 70 a provides a relatively small lightpass aperture, the image sensor receives less light, but the backgroundin the image is relatively clear. The captured images as shown in FIG.39 and FIG. 40 have a relatively small field of view and depth of view,and the compact camera module 70 a having a controllable aperture stopcan be used for shooting moving targets. For example, the lens drivingunit can drive the lens assembly to quickly and continuously autofocuson the target, such that the captured image of the target would not beblurred due to long focusing distance. When imaging, the compact cameramodule 70 a having a controllable aperture stop can further performoptical zoom for imaged objects so as to obtain clearer images. Inaddition, the camera module 70 e can determine depth information of theimaged object. In this embodiment, the electronic device 7 includesmultiple camera modules 70 a, 70 b, 70 c, 70 d, and 70 e, but thepresent disclosure is not limited to the number and arrangement ofcamera modules.

When a user captures images of an object OBJ, light rays converge in thecamera module 70 a, the camera module 70 b or the camera module 70 c togenerate images, and the flash module 72 is activated for lightsupplement. The focus assist module 73 detects the object distance ofthe imaged object OBJ to achieve fast auto focusing. The image signalprocessor is configured to optimize the captured image to improve imagequality. The light beam emitted from the focus assist module 73 can beeither conventional infrared or laser.

In addition, the light rays may converge in the camera module 70 d orthe camera module 70 e to generate images. The electronic device 7 caninclude a reminder light 82 that can be illuminated to remind the userthat the camera module 70 d or the camera module 70 e is working. Thedisplay module 75 can be a touch screen or physical buttons such as azoom button 751 and a shutter release button 752. The user is able tointeract with the display module 75 and the image software processorhaving multiple functions to capture images and complete imageprocessing. The image processed by the image software processor can bedisplayed on the display module 75. The user can replay the previouslycaptured image through an image playback button 753 of the displaymodule 75, can choose a suitable camera module for shooting through acamera module switching button 754 of the display module 75, and canproperly adjust shooting parameters according to current shootingsituations through an integrated menu button 755 of the display module75.

Further, the electronic device 7 further includes a circuit board 78 anda plurality of electronic components 79 disposed on the circuit board78. The camera modules 70 a, 70 b, 70 c, 70 d, and 70 e are electricallyconnected to the electronic component 79 via connectors 781 on thecircuit board 78. The electronic components 79 can include a signalemitting module and can transmit image(s) to other electronic device ora cloud storage via the signal emitting module. The signal emittingmodule can be a wireless fidelity (WiFi) module, a Bluetooth module, aninfrared module, a network service module or an integrated module fortransmitting various signals mentioned above, and the present disclosureis not limited thereto.

The electronic components 79 can also include a storage unit, a randomaccess memory for storing image information, a gyroscope, and a positionlocator for facilitating the navigation or positioning of the electronicdevice 7. In this embodiment, the image signal processor, the imagesoftware processor and the random access memory are integrated into asingle chip system 74, but the present disclosure is not limitedthereto. In some other embodiments, the electronic components can alsobe integrated in the camera module or can also be disposed on one of thecircuit boards. In addition, the user can use the biometricidentification device 77 to turn on and unlock the electronic device 7.

The smartphone in this embodiment is only exemplary for showing thecompact camera module of the present disclosure installed in anelectronic device, and the present disclosure is not limited thereto.The compact camera module can be optionally applied to optical systemswith a movable focus. Furthermore, the compact camera module featuresgood capability in aberration corrections and high image quality, andcan be applied to 3D (three-dimensional) image capturing applications,in products such as digital cameras, mobile devices, digital tablets,smart televisions, network surveillance devices, dashboard cameras,vehicle backup cameras, multi-camera devices, image recognition systems,motion sensing input devices, wearable devices and other electronicimaging devices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatthe present disclosure shows different data of the differentembodiments; however, the data of the different embodiments are obtainedfrom experiments. The embodiments were chosen and described in order tobest explain the principles of the disclosure and its practicalapplications, to thereby enable others skilled in the art to bestutilize the disclosure and various embodiments with variousmodifications as are suited to the particular use contemplated. Theembodiments depicted above and the appended drawings are exemplary andare not intended to be exhaustive or to limit the scope of the presentdisclosure to the precise forms disclosed. Many modifications andvariations are possible in view of the above teachings.

What is claimed is:
 1. A controllable aperture stop comprising: a lightpass portion comprising a plurality of movable blades, and the pluralityof movable blades together surrounding a light pass aperture; a fixedportion having a plurality of shaft structures respectively disposedcorresponding to the plurality of movable blades; a driving partcomprising: a rotatable element connected to the plurality of movableblades, and the rotatable element configured to drive the plurality ofmovable blades to rotate respectively relative to the plurality of shaftstructures so as to adjust a size of the light pass aperture; a firstmagnet disposed on the rotatable element; and a first coil disposedcorresponding to the first magnet, the first coil located farther awayfrom the light pass aperture than the first magnet to the light passaperture, and the first magnet and the first coil configured to drivethe rotatable element to rotate around the light pass aperture; and aplurality of rollable elements disposed between the fixed portion andthe rotatable element and arranged around the light pass aperture, sothat the rotatable element can be rotated relative to the fixed portion;wherein a farthest distance between the first magnet and a central axisof the light pass aperture is rm, a shortest distance between the firstcoil and the central axis is rc, a shortest distance between theplurality of rollable elements and the central axis is rb, and thefollowing conditions are satisfied:0.5≤rm/rc<1; and0.6≤rb/rm≤1.8.
 2. The controllable aperture stop of claim 1, wherein thefixed portion comprises: a shaft element having the plurality of shaftstructures; and a frame element having a through hole, wherein thethrough hole and the light pass aperture correspond to each other, theframe element and the shaft element are fixed to each other, and theplurality of rollable elements are disposed between the frame elementand the rotatable element.
 3. The controllable aperture stop of claim 2,wherein the frame element comprises a curved installation structure, andat least one of the plurality of rollable elements is disposed on thecurved installation structure and movable along the curved installationstructure in a direction around the light pass aperture.
 4. Thecontrollable aperture stop of claim 1, wherein the fixed portioncomprises a cover, the plurality of movable blades are disposed betweenthe cover and the rotatable element, the cover comprises a positioninghole, and the positioning hole is disposed corresponding to one of theplurality of shaft structures.
 5. The controllable aperture stop ofclaim 4, wherein the cover comprises an inner surface facing theplurality of movable blades; wherein an arithmetic average roughness(Ra) of the inner surface is smaller than 0.25 μm.
 6. The controllableaperture stop of claim 4, wherein the cover comprises an inner surfaceand an outer surface, the inner surface faces the plurality of movableblades, the outer surface is located farther away from the plurality ofmovable blades than the inner surface to the plurality of movableblades, and a reflectivity of the outer surface is smaller than areflectivity of the inner surface.
 7. The controllable aperture stop ofclaim 1, wherein the first magnet is in an arc shape, and a direction ofthe arc shape corresponds to a rotation direction of the first magnet.8. The controllable aperture stop of claim 1, wherein the fixed portioncomprises a top contact surface, and the plurality of movable blades aredisposed on the top contact surface; wherein an arithmetic averageroughness (Ra) of the top contact surface is smaller or equal to 0.25μm.
 9. The controllable aperture stop of claim 1, wherein the rotatableelement comprises a bottom contact surface, and the plurality of movableblades are disposed on the bottom contact surface; wherein an arithmeticaverage roughness (Ra) of the bottom contact surface is smaller than0.25 μm.
 10. The controllable aperture stop of claim 1, wherein thedriving part further comprises a driver controller electricallyconnected to the first coil.
 11. The controllable aperture stop of claim10, wherein the driver controller has a position sensing circuit. 12.The controllable aperture stop of claim 1, wherein the plurality ofmovable blades consist of a first blade assembly and a second bladeassembly, the first blade assembly comprises some of the plurality ofmovable blades, and the second blade assembly comprises others of theplurality of movable blades; wherein in a direction parallel to thecentral axis, the plurality of movable blades of the first bladeassembly do not overlap with one another, the plurality of movableblades of the second blade assembly do not overlap with one another, andthe first blade assembly and the second blade assembly at leastpartially overlap with each other; and wherein in a direction around thelight pass aperture, the plurality of movable blades of the first bladeassembly at least partially overlap with one another, the plurality ofmovable blades of the second blade assembly at least partially overlapwith one another, and the first blade assembly and the second bladeassembly do not overlap with each other.
 13. The controllable aperturestop of claim 1, wherein the driving part further comprises a secondmagnet and a second coil, and the second magnet and the second coil aredisposed symmetrical to the first magnet and the first coil.
 14. Thecontrollable aperture stop of claim 1, wherein when the controllableaperture stop is in a maximum aperture state, a difference between afarthest distance and a shortest distance between a periphery of thelight pass aperture and the central axis is smaller than 9.8%.
 15. Acompact camera module comprising: the controllable aperture stop ofclaim 1, wherein the controllable aperture stop is disposed on anaperture position of the compact camera module; wherein a focal lengthof the compact camera module is f, an aperture area of the light passaperture is a1, and the following condition is satisfied:1.19≤f/√(a1)≤11.99.
 16. An electronic device comprising: the compactcamera module of claim
 15. 17. A controllable aperture stop comprising:a light pass portion comprising a plurality of movable blades, and theplurality of movable blades together surrounding a light pass aperture;a fixed portion having a plurality of shaft structures respectivelydisposed corresponding to the plurality of movable blades; a drivingpart comprising: a rotatable element connected to the plurality ofmovable blades, and the rotatable element configured to drive theplurality of movable blades to rotate respectively relative to theplurality of shaft structures so as to adjust a size of the light passaperture; a first magnet disposed on the rotatable element; and a firstcoil disposed corresponding to the first magnet, the first coil locatedfarther away from the light pass aperture than the first magnet to thelight pass aperture, and the first magnet and the first coil configuredto drive the rotatable element to rotate around the light pass aperture;and a plurality of rollable elements disposed between the fixed portionand the rotatable element and arranged around the light pass aperture,so that the rotatable element can be rotated relative to the fixedportion; wherein the fixed portion comprises a frame element, the frameelement is in physical contact with the plurality of rollable elementsso as to support the plurality of rollable elements and the rotatableelement, the frame element comprises a metal component and a cladcomponent, and the metal component is insert-molded with the cladcomponent to together form the frame element; wherein the metalcomponent has a plurality of filled holes, the clad component is filledinto the plurality of filled holes, and the plurality of filled holesand the first magnet do not overlap with each other in a directionparallel to a central axis of the light pass aperture.
 18. Thecontrollable aperture stop of claim 17, wherein the fixed portionfurther comprises a shaft element, the shaft element has the pluralityof shaft structures, and the shaft element and the frame element arefixed to each other.
 19. The controllable aperture stop of claim 17,wherein the fixed portion further comprises a cover, the plurality ofmovable blades are disposed between the cover and the rotatable element,the cover comprises a positioning hole, and the positioning hole isdisposed corresponding to one of the plurality of shaft structures. 20.The controllable aperture stop of claim 19, wherein the cover comprisesan inner surface facing the plurality of movable blades; wherein anarithmetic average roughness (Ra) of the inner surface is smaller than0.25 μm.
 21. The controllable aperture stop of claim 19, wherein thecover comprises an inner surface and an outer surface, the inner surfacefaces the plurality of movable blades, the outer surface is locatedfarther away from the plurality of movable blades than the inner surfaceto the plurality of movable blades, and a reflectivity of the outersurface is smaller than a reflectivity of the inner surface.
 22. Thecontrollable aperture stop of claim 17, wherein the first magnet is inan arc shape, and a direction of the arc shape corresponds to a rotationdirection of the first magnet.
 23. The controllable aperture stop ofclaim 17, wherein the fixed portion further comprises a top contactsurface, and the plurality of movable blades are disposed on the topcontact surface; wherein an arithmetic average roughness (Ra) of the topcontact surface is smaller or equal to 0.25 μm.
 24. The controllableaperture stop of claim 17, wherein the rotatable element comprises abottom contact surface, and the plurality of movable blades are disposedon the bottom contact surface; wherein an arithmetic average roughness(Ra) of the bottom contact surface is smaller than 0.25 μm.
 25. Thecontrollable aperture stop of claim 17, wherein the frame elementfurther comprises a curved installation structure, and at least one ofthe plurality of rollable elements is disposed on the curvedinstallation structure and movable along the curved installationstructure in a direction around the light pass aperture.
 26. Thecontrollable aperture stop of claim 17, wherein the driving part furthercomprises a driver controller electrically connected to the first coil.27. The controllable aperture stop of claim 26, wherein the drivercontroller has a position sensing circuit.
 28. The controllable aperturestop of claim 17, wherein the plurality of movable blades consist of afirst blade assembly and a second blade assembly, the first bladeassembly comprises some of the plurality of movable blades, and thesecond blade assembly comprises others of the plurality of movableblades; wherein in a direction parallel to the central axis, theplurality of movable blades of the first blade assembly do not overlapwith one another, the plurality of movable blades of the second bladeassembly do not overlap with one another, and the first blade assemblyand the second blade assembly at least partially overlap with eachother; and wherein in a direction around the light pass aperture, theplurality of movable blades of the first blade assembly at leastpartially overlap with one another, the plurality of movable blades ofthe second blade assembly at least partially overlap with one another,and the first blade assembly and the second blade assembly do notoverlap with each other.
 29. The controllable aperture stop of claim 17,wherein the driving part further comprises a second magnet and a secondcoil, and the second magnet and the second coil are disposed symmetricalto the first magnet and the first coil.
 30. The controllable aperturestop of claim 17, wherein when the controllable aperture stop is in amaximum aperture state, a difference between a farthest distance and ashortest distance between a periphery of the light pass aperture and thecentral axis is smaller than 9.8%.
 31. The controllable aperture stop ofclaim 17, wherein one of the plurality of filled holes is a C-shapedhole.
 32. The controllable aperture stop of claim 17, wherein the metalcomponent is ferromagnetic, the metal component and the first magnet aredisposed corresponding to each other so as to generate a magneticattraction, and the magnetic attraction forces the first magnet and therotatable element to exert a pressure on the plurality of rollableelements.
 33. The controllable aperture stop of claim 17, wherein theframe element has a plurality of recesses, the plurality of recesses arerespectively disposed corresponding to the plurality of filled holes,and the plurality of filled holes are respectively partially exposed bythe plurality of recesses.
 34. A compact camera module comprising: thecontrollable aperture stop of claim 17, wherein the controllableaperture stop is disposed on an aperture position of the compact cameramodule; wherein a focal length of the compact camera module is f, anaperture area of the light pass aperture is a1, and the followingcondition is satisfied:1.19≤f/√(a1)≤11.99.
 35. An electronic device comprising: the compactcamera module of claim
 34. 36. A controllable aperture stop comprising:a light pass portion comprising a plurality of movable blades, and theplurality of movable blades together surrounding a light pass aperture;a fixed portion having a plurality of shaft structures respectivelydisposed corresponding to the plurality of movable blades; a drivingpart comprising: a rotatable element connected to the plurality ofmovable blades, and the rotatable element configured to drive theplurality of movable blades to rotate respectively relative to theplurality of shaft structures so as to adjust a size of the light passaperture; a first magnet disposed on the rotatable element; and a firstcoil disposed corresponding to the first magnet, the first coil locatedfarther away from the light pass aperture than the first magnet to thelight pass aperture, and the first magnet and the first coil configuredto drive the rotatable element to rotate around the light pass aperture;and a plurality of rollable elements disposed between the fixed portionand the rotatable element and arranged around the light pass aperture,so that the rotatable element can be rotated relative to the fixedportion; wherein the fixed portion comprises a frame element, the frameelement is in physical contact with the plurality of rollable elementsso as to support the plurality of rollable elements and the rotatableelement, the frame element comprises a metal component and a cladcomponent, and the metal component is insert-molded with the cladcomponent to together form the frame element; wherein the metalcomponent comprises an attraction portion, the attraction portion isferromagnetic and disposed corresponding to the first magnet so as togenerate a magnetic attraction, and the magnetic attraction forces thefirst magnet and the rotatable element to exert a pressure on theplurality of rollable elements; wherein the first magnet comprises afirst surface, a second surface and a connection surface, the firstsurface faces the first coil, the second surface is located closer tothe light pass aperture than the first surface to the light passaperture, the connection surface is connected to the first surface andthe second surface, and the attraction portion is disposed correspondingto the connection surface.
 37. The controllable aperture stop of claim36, wherein the fixed portion further comprises a shaft element havingthe plurality of shaft structures, and the shaft element and the frameelement are fixed to each other.
 38. The controllable aperture stop ofclaim 36, wherein the fixed portion further comprises a cover, theplurality of movable blades are disposed between the cover and therotatable element, the cover comprises a positioning hole, and thepositioning hole is disposed corresponding to one of the plurality ofshaft structures.
 39. The controllable aperture stop of claim 38,wherein the cover comprises an inner surface facing the plurality ofmovable blades; wherein an arithmetic average roughness (Ra) of theinner surface is smaller than 0.25 μm.
 40. The controllable aperturestop of claim 38, wherein the cover comprises an inner surface and anouter surface, the inner surface faces the plurality of movable blades,the outer surface is located farther away from the plurality of movableblades than the inner surface to the plurality of movable blades, and areflectivity of the outer surface is smaller than a reflectivity of theinner surface.
 41. The controllable aperture stop of claim 36, whereinthe first magnet is in an arc shape, and a direction of the arc shapecorresponds to a rotation direction of the first magnet.
 42. Thecontrollable aperture stop of claim 36, wherein the fixed portionfurther comprises a top contact surface, and the plurality of movableblades are disposed on the top contact surface; wherein an arithmeticaverage roughness (Ra) of the top contact surface is smaller or equal to0.25 μm.
 43. The controllable aperture stop of claim 36, wherein therotatable element comprises a bottom contact surface, and the pluralityof movable blades are disposed on the bottom contact surface; wherein anarithmetic average roughness (Ra) of the bottom contact surface issmaller than 0.25 μm.
 44. The controllable aperture stop of claim 36,wherein the frame element further comprises a curved installationstructure, and at least one of the plurality of rollable elements isdisposed on the curved installation structure and movable along thecurved installation structure in a direction around the light passaperture.
 45. The controllable aperture stop of claim 36, wherein thedriving part further comprises a driver controller electricallyconnected to the first coil.
 46. The controllable aperture stop of claim45, wherein the driver controller has a position sensing circuit. 47.The controllable aperture stop of claim 36, wherein the plurality ofmovable blades consist of a first blade assembly and a second bladeassembly, the first blade assembly comprises some of the plurality ofmovable blades, and the second blade assembly comprises others of theplurality of movable blades; wherein in a direction parallel to acentral axis of the light pass aperture, the plurality of movable bladesof the first blade assembly do not overlap with one another, theplurality of movable blades of the second blade assembly do not overlapwith one another, and the first blade assembly and the second bladeassembly at least partially overlap with each other; and wherein in adirection around the light pass aperture, the plurality of movableblades of the first blade assembly at least partially overlap with oneanother, the plurality of movable blades of the second blade assembly atleast partially overlap with one another, and the first blade assemblyand the second blade assembly do not overlap with each other.
 48. Thecontrollable aperture stop of claim 36, wherein the driving part furthercomprises a second magnet and a second coil, and the second magnet andthe second coil are disposed symmetrical to the first magnet and thefirst coil.
 49. The controllable aperture stop of claim 36, wherein whenthe controllable aperture stop is in a maximum aperture state, adifference between a farthest distance and a shortest distance between aperiphery of the light pass aperture and a central axis of the lightpass aperture is smaller than 9.8%.
 50. A compact camera modulecomprising: the controllable aperture stop of claim 36, wherein thecontrollable aperture stop is disposed on an aperture position of thecompact camera module; wherein a focal length of the compact cameramodule is f, an aperture area of the light pass aperture is a1, and thefollowing condition is satisfied:1.19≤f/√(a1)≤11.99.
 51. An electronic device comprising: the compactcamera module of claim
 50. 52. A controllable aperture stop comprising:a light pass portion comprising a plurality of movable blades, and theplurality of movable blades together surrounding a light pass aperture;a fixed portion having a plurality of shaft structures respectivelydisposed corresponding to the plurality of movable blades; and a drivingpart comprising: a rotatable element connected to the plurality ofmovable blades, and the rotatable element configured to drive theplurality of movable blades to rotate respectively relative to theplurality of shaft structures so as to adjust a size of the light passaperture; a first magnet disposed on the rotatable element; a first coildisposed corresponding to the first magnet, the first coil locatedfarther away from the light pass aperture than the first magnet to thelight pass aperture, and the first magnet and the first coil configuredto drive the rotatable element to rotate around the light pass aperture;and an electronic component having a position sensing circuit, theelectronic component disposed corresponding to the first magnet, and theelectronic component located farther away from the light pass aperturethan the first magnet to the light pass aperture; wherein a farthestdistance between the first magnet and a central axis of the light passaperture is rm, a shortest distance between the first coil and thecentral axis is rc, a shortest distance between the electronic componentand the central axis is rp, and the following conditions are satisfied:0.5≤rm/rc<1; and0.5≤rm/rp<1.
 53. The controllable aperture stop of claim 52, furthercomprising a plurality of rollable elements, wherein the plurality ofrollable elements are disposed between the fixed portion and therotatable element and arranged around the light pass aperture, so thatthe rotatable element can be rotated relative to the fixed portion. 54.The controllable aperture stop of claim 52, wherein the fixed portioncomprises a cover, the plurality of movable blades are disposed betweenthe cover and the rotatable element, the cover comprises a positioninghole, and the positioning hole is disposed corresponding to one of theplurality of shaft structures.
 55. The controllable aperture stop ofclaim 52, wherein the electronic component is a driver controller, andthe driver controller is electrically connected to the first coil. 56.The controllable aperture stop of claim 52, wherein the driving partfurther comprises a second magnet and a second coil, and the secondmagnet and the second coil are disposed symmetrical to the first magnetand the first coil.
 57. A compact camera module comprising: thecontrollable aperture stop of claim 52, wherein the controllableaperture stop is disposed on an aperture position of the compact cameramodule; wherein a focal length of the compact camera module is f, anaperture area of the light pass aperture is a1, and the followingcondition is satisfied:1.19≤f/√(a1)≤11.99.
 58. An electronic device comprising: the compactcamera module of claim
 57. 59. A controllable aperture stop comprising:a light pass portion comprising a plurality of movable blades, and theplurality of movable blades together surrounding a light pass aperture;a fixed portion having a plurality of shaft structures respectivelydisposed corresponding to the plurality of movable blades; a drivingpart comprising: a rotatable element rotatable around the light passaperture, the rotatable element connected to the plurality of movableblades, and the rotatable element configured to drive the plurality ofmovable blades to rotate respectively relative to the plurality of shaftstructures so as to adjust a size of the light pass aperture; a firstmagnet disposed on the rotatable element; and an electronic componenthaving a position sensing circuit, the electronic component disposedcorresponding to the first magnet, and the electronic component locatedfarther away from the light pass aperture than the first magnet to thelight pass aperture; and a plurality of rollable elements disposedbetween the fixed portion and the rotatable element and arranged aroundthe light pass aperture, so that the rotatable element can be rotatedrelative to the fixed portion; wherein a farthest distance between thefirst magnet and a central axis of the light pass aperture is rm, ashortest distance between the electronic component and the central axisis rp, a shortest distance of the plurality of rollable elements and thecentral axis is rb, and the following conditions are satisfied:0.5≤rm/rp<1; and0.6≤rb/rm≤1.8.
 60. The controllable aperture stop of claim 59, whereinthe fixed portion comprises: a shaft element having the plurality ofshaft structures; and a frame element having a through hole, wherein thethrough hole and the light pass aperture correspond to each other, theframe element and the shaft element are fixed to each other, and theplurality of rollable elements are disposed between the frame elementand the rotatable element.
 61. The controllable aperture stop of claim60, wherein the frame element comprises a metal component and a cladcomponent, and the metal component is insert-molded with the cladcomponent to together form the frame element; wherein the metalcomponent comprises an attraction portion, the attraction portion isferromagnetic and disposed corresponding to the first magnet so as togenerate a magnetic attraction, and the magnetic attraction forces thefirst magnet and the rotatable element to exert a pressure on theplurality of rollable elements.
 62. The controllable aperture stop ofclaim 61, wherein the driving part further comprises a second magnet,and the second magnet and the first magnet are symmetrically arranged.63. The controllable aperture stop of claim 60, wherein the frameelement comprises a metal component and a clad component, and the metalcomponent is insert-molded with the clad component to together form theframe element; wherein the metal component is ferromagnetic, the metalcomponent and the first magnet are disposed corresponding to each otherso as to generate a magnetic attraction, and the magnetic attractionforces the first magnet and the rotatable element to exert a pressure onthe plurality of rollable elements.
 64. The controllable aperture stopof claim 63, wherein the driving part further comprises a second magnet,and the second magnet and the first magnet are symmetrically arranged.65. The controllable aperture stop of claim 60, wherein the frameelement comprises a curved installation structure, and at least one ofthe plurality of rollable elements is disposed on the curvedinstallation structure and movable along the curved installationstructure in a direction around the light pass aperture.
 66. Thecontrollable aperture stop of claim 59, wherein the first magnet is inan arc shape, and a direction of the arc shape corresponds to a rotationdirection of the first magnet.
 67. A compact camera module comprising:the controllable aperture stop of claim 59, wherein the controllableaperture stop is disposed on an aperture position of the compact cameramodule; wherein a focal length of the compact camera module is f, anaperture area of the light pass aperture is a1, and the followingcondition is satisfied:1.19≤f/√(a1)≤11.99.
 68. An electronic device comprising: the compactcamera module of claim 67.